Fix Base44 Authentication Loop

STOP! You're in an authentication loop. Here's how to fix it:

CRITICAL: Base44 handles ALL authentication automatically. You should NEVER create:
- Login pages
- Signup pages  
- Password reset pages
- Any authentication UI

HOW BASE44 AUTHENTICATION WORKS:

1. Users are invited through the Base44 Dashboard (not through code)
   - Go to Dashboard → Users → Invite User
   - Enter email and role
   - User receives invitation email
   - User creates password through Base44's system

2. For protected pages, check if user is logged in:

```javascript
import { base44 } from "@/api/base44Client";
import { useEffect, useState } from "react";
import { createPageUrl } from "@/utils";

export default function MyProtectedPage() {
  const [user, setUser] = useState(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    const checkAuth = async () => {
      try {
        const currentUser = await base44.auth.me();
        setUser(currentUser);
      } catch (error) {
        // Not logged in - redirect to Base44 login page
        base44.auth.redirectToLogin(createPageUrl("MyProtectedPage"));
      }
      setLoading(false);
    };
    checkAuth();
  }, []);

  if (loading) return <div>Loading...</div>;

  return (
    <div>
      <h1>Welcome, {user.full_name}!</h1>
      <button onClick={() => base44.auth.logout()}>
        Logout
      </button>
    </div>
  );
}
```

3. For public pages that should work for everyone:

```javascript
import { base44 } from "@/api/base44Client";
import { useEffect, useState } from "react";

export default function PublicPage() {
  const [user, setUser] = useState(null);

  useEffect(() => {
    const checkAuth = async () => {
      try {
        const currentUser = await base44.auth.me();
        setUser(currentUser);
      } catch (error) {
        // Not logged in - that's okay for public pages
      }
    };
    checkAuth();
  }, []);

  return (
    <div>
      <h1>Public Content</h1>
      {user ? (
        <p>Welcome, {user.full_name}!</p>
      ) : (
        <button onClick={() => base44.auth.redirectToLogin()}>
          Login
        </button>
      )}
    </div>
  );
}
```

WHAT TO DELETE:
- Delete any Login.jsx or Login.js pages
- Delete any Signup.jsx or Signup.js pages
- Delete any Register pages
- Delete any authentication forms

WHAT TO KEEP:
- Regular app pages (Dashboard, Settings, etc.)
- The useEffect pattern above for checking auth

THE USER ENTITY:
- Already exists automatically
- Has these fields: id, email, full_name, role, created_date
- You can add custom fields but DON'T override the built-in ones

TO ADD CUSTOM USER FIELDS:
Create entities/User.json with ONLY your custom fields:

```json
{
  "name": "User",
  "type": "object",
  "properties": {
    "phone_number": {
      "type": "string",
      "description": "User's phone number"
    },
    "company": {
      "type": "string",
      "description": "User's company"
    }
  }
}
```

DON'T include id, email, full_name, or role in your User entity - they're automatic!

TO UPDATE CURRENT USER:
```javascript
await base44.auth.updateMe({
  phone_number: "+1234567890",
  company: "Acme Corp"
});
```

SUMMARY:
1. Delete all login/signup pages
2. Use base44.auth.me() to check if logged in
3. Use base44.auth.redirectToLogin() to send users to login
4. Use base44.auth.logout() to logout
5. Invite users through Dashboard → Users

That's it! Stop trying to build authentication - Base44 does it for you.